Position sensor using a moveable ferromagnetic element

摘要

The invention relates to a contactless magnetic sensor for detecting a linear or angular position, comprising a moveable ferromagnetic element (1) the position of which is detected, and a stator assembly (2) itself, comprising two ferromagnetic parts (3, 4), defining with the moveable ferromagnetic element (1) two respective air gaps (7, 8), a permanent magnet (5) and a magneto-sensitive element (6) subjected to a magnetic field that depends on the position of the moveable ferromagnetic element (1) and designed to deliver a measurement signal that depends on the magnetic field to which it is subjected. According to the invention, the two ferromagnetic parts (3, 4) define therebetween a third air gap (9), the permanent magnet (5) being rigidly connected only to the first ferromagnetic part (3) and the magneto-sensitive element (6) being placed in the third air gap (9).

主权项

1. A contactless magnetic sensor for detecting a linear or angular position, comprising a stator assembly and a ferromagnetic element moveable relative to the stator assembly and the position of which is detected, with the stator assembly itself comprising at least a first and a second ferromagnetic part, at least a first permanent magnet, and at least a magneto-sensitive element subjected to a magnetic field that depends on the position of the moveable ferromagnetic element and designed to deliver a measurement signal that depends on the magnetic field to which it is subjected, with the first permanent magnet being rigidly connected to the first ferromagnetic part, and the ferromagnetic parts defining with the moveable ferromagnetic element at least a first and a second air gap, characterized in that the first permanent magnet is rigidly connected only to the first ferromagnetic part, in that the two ferromagnetic parts define therebetween at least a third air gap, and in that the magneto-sensitive element is placed in the third air gap.